linux-kernel - [PATCH v2 0/2] amd/iommu: Preserve domain ids inside the kdump kernel

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Message-ID: <20251121091116.25663-1-sarunkod@amd.com>
Date: Fri, 21 Nov 2025 14:41:14 +0530
From: Sairaj Kodilkar <sarunkod@....com>
To: <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
	<vasant.hegde@....com>, <robin.murphy@....com>, <ashish.kalra@....com>,
	<will@...nel.org>, <jgg@...dia.com>, Sairaj Kodilkar <sarunkod@....com>
Subject: [PATCH v2 0/2] amd/iommu: Preserve domain ids inside the kdump kernel

Patch 1: Reserves the Domain IDs allocated by the host kernel while reusing its
	 device table inside kdump kernel
Patch 2: Cleanup around pdom allocation

-------------------------------------------------------------------------------

Changes since v1:
https://lore.kernel.org/all/20251114104442.23296-1-sarunkod@amd.com/
P1:
  - Use FIELD_GET to read the DTE fields [Ankit]
  - Use GFP_KERNEL instead of GFP_ATOMIC [Jason]
  - Remove print on ENOMEM [Jason]

P2:
  - Use u32 instead of int [Jason]
  - pass gfp flags as argument to 'amd_iommu_pdom_id_reserve' [Jason]

-------------------------------------------------------------------------------

Base Commit: 91920a9d87f5192c56ba5bf3e133aeb3576b705d (iommu-next)

-------------------------------------------------------------------------------

Fixes: 38e5f33ee359 ("iommu/amd: Reuse device table for kdump")
Signed-off-by: Sairaj Kodilkar <sarunkod@....com>

Sairaj Kodilkar (2):
  amd/iommu: Preserve domain ids inside the kdump kernel
  amd/iommu: Make protection domain ID functions non-static

 drivers/iommu/amd/amd_iommu.h |  5 +++++
 drivers/iommu/amd/init.c      | 24 +++++++++++++++++++++---
 drivers/iommu/amd/iommu.c     | 27 ++++++++++++++++++---------
 3 files changed, 44 insertions(+), 12 deletions(-)

-- 
2.34.1